Hello, I am working on a Dover T4 and am having trouble getting the elevator to pass a NTST/NTSB ETSB/ETST. Also I am having a problem with OS tripping randomly.

For the NTS/ETS i have replaced the transducer head on the car top. I have replaced the modules on the PMI card. I have tried replacing the CPU and DSP board.

For the OS tripping I replaced the governor encoder sensor.

Not sure what else to do here.